Ask YC: Examples of freemium companies that did not work?

After the recent discussion on the freemium "business model", I'm doing some research (for a future blog post as well as just personal interest) into what makes companies successful or not using freemium. The funny thing: though it's very easy to find companies that use freemium successfully, it's much more difficult to find companies that failed. Does anyone have examples of companies that failed trying to use freemium and either died completely or switched to another (more or less successful) model?